I don't trust the disk clean up either. Sometimes, if you delete the desktop.ini in your recycle.bin, it will show a lot of folders inside it which you can just delete. ( or do a
dir /a /s inside it ).
For cleaning up windows, I do the following :
- Clean your temp folders, you got \windows\temp and also a folder inside user\<name>\*somewhere* or documents and settings\<user>\*somewhere* , check both of them, in time they can grow to several GBs! You can delete anything inside those without a problem.
- Check your IE cache, it sets it way too high. Sometimes more than 1GB! I usually set it to 1MB.
- \windows\<blue folders> , they are compressed folders for rollback of windows updates. You almost never need them. You can just delete them.
- \windows\system32\dllcache ( sometimes doesn't show in explorer, you gott'a type it ), it contains backup of a whole windows installation, tausands of files, around 1GB or so. You can also delete contents of this folder without any problems.
- Having 8GB RAM, I also set the swap file to ZERO.
All that said, the above is for "power users", not for average joe six pack. Although, I have done the above since windows 2000 on my machines, my customer's machines, my family's machines without ANY problem. Ever.
There is also :
Enjoy! 
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